Revert "[lldb] Add empty implementation for DWARFASTParserSwift::FindDefinitionTypeForDIE"

This reverts commit d1782cc as the
upstream change adding it was reverted. Keeping it in history so we can
re-apply.

Author: bnbarham

lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserSwift.cpp

@@ -297,8 +297,3 @@ lldb_private::CompilerDeclContext
 DWARFASTParserSwift::GetDeclContextContainingUIDFromDWARF(const DWARFDIE &die) {
   return CompilerDeclContext();
 }
-
-lldb_private::Type *
-DWARFASTParserSwift::FindDefinitionTypeForDIE(const DWARFDIE &die) {
-  return nullptr;
-}

lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserSwift.h

@@ -93,8 +93,6 @@ class DWARFASTParserSwift : public lldb_private::plugin::dwarf::DWARFASTParser,
   std::unique_ptr<swift::reflection::MultiPayloadEnumDescriptorBase>
   getMultiPayloadEnumDescriptor(const swift::reflection::TypeRef *TR) override;
 
-  lldb_private::Type *FindDefinitionTypeForDIE(const DWARFDIE &die) override;
-
 private:
   /// Returns the canonical demangle tree of a die's type.
   NodePointer GetCanonicalDemangleTree(DWARFDIE &die);